Homophones are the terms that have multiple-meaning.
Your title depends on what your text and reasons are specifically about and what the information you are given is, however I would choose whichever one fits your information the best. However, they all are talking about bicycles. I would most likely choose the health benefits of bicycling.
Connotation of dump generally is Negative. When you first hear dump you think of a dumpster or garbage so it's negative
D. Babysit for you next weekend? Sure, I'll just cancel my trip to Disney
World. It probably would have been mildly entertaining, but that's O.K.
